Improvement in nut-lock



JOHN R. CRIBBS, OF GAfRljblliR,l ILLINOIS.

Lenen Patent No. 87,761, ma Ma/rch 16, 1869.

mnovmvmw'r' IN NUT-Loox.

The Schedule 'referred to in these Lett-ers Patent and making past ofthe same.

To whom it may/concern Be it known that I, JQHN R. ORIBBs, of Gardner,in the county of Grundy, and State of Illinois, have invented anew andimprovedl Screw-Bolt for bolting together compound or continuousrailroadrails,'and for other purposes, where thc nuts are liable to beaccidentally turned off; and I hereby declare that the following is afull and exact description thereof, reference being had'to theaccompanying drawings, and to the letters of reference marked thereon.

The object of this invention is to-prevent the nuts of screw-bolts fromturning oi of the bolt, by a continued jar or concussion, or byaccident; and

It consists in the' use of a right and left-hand screw cut upon thebolt, and upon which two nuts' are turned, one havingaright-hand and theother alefthand screwthread cut therereon, a. washer interposed betweenthe nuts, and a leck or keeper surrounding both nuts.

To enable others skilled in the art to'make and use my invention, I willdescribe its construction and operation.

Figure 1 representsabolt, with a right and left screwthread thereon.. v

Figur-e2 is a bolt with the nuts and washer turned on. A Figure is aperspective view of thelock, or keeper.

A, in the drawings, represents'a cornrnonscrew-bolt, having head B, andright and left screw-:threads a and b thereon.

a is the right-,hand screw-threadandiiis :larger in diameter' than thatof the left-hand thread,` b, so as to allow the nut c freely to slipover the thread b.

G is the nut, with a right-hand screw-thread init, and turns upon'thread a.

O is a nut, with a left-hand screw-threadand is turned upon the thread bofthe bolt.

The screw-threads on the bolt may be cut thereverse from what is shown,and havethe threads in the nuts cut to fit thethread on the bolt.-

D is a metal keeper, orlock, which slips on over the nuts C O', whenthey are in position. This metal keeper may be f cast or sheet-metal,and have ears d, as seen in fg. 3, which, when the nuts are in theright' position, will be coincident to the depression d' d' in the nutsO C', and canbe turned 4down into such depressions, which will perfectly'secure the two nuts, and hold them in their position, and preventeither from turning.

keeper D into washer c. Either of these methods willA perfectly securethe keeper upon the nuts, and prevent their being turned off, unless thekeeper is first removed,'and then the nuts, by turning them in oppositedirections, will release the bolt.

A bolt thus constructed, with the'screw-threads ande nuts, and held inposition by the keeper, will perfectly secure the safety of the hold-thebolt has, against anyV tendency by a continuous' jar, such-as a train ofcars will produce inpassing over the rails, and prevent the nuts fromturning o, or becoming loose, so as to rattle.

The bolt is constructed so that the screw-thread will allow nut O to beturned hard up against whatever is to'be held. Then washer c is placedover the bolt, and against nut O, when nut O' is turned on in thereverse direction from nut C, and hard against washer c, and so as to becoincident therewith, when keeper D is placed over the nuts, andthescrew e turned home into washer c, or the ears d are bent intodepressions d d', which will, as before stated, perfectly secure thenuts in place, and prevent their running ol.

I am aware that screw-bolts, with' screw-threads thereon, having a rightand lett-hand direction, with nutsto fitv such screw-threads, have beenin use. Such screw-bolt'I do not alone claim; vnor .do I claim nutswithout washer c, and screw c, substantiallyas de'- scribed. JOHN R.ORIBBS.

Witnesses:

'HENRY M'.MYGAT1, JAMES l. LAIRD.

.having aright'and left-hand screw-thread: but hav-l

